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Greenroom vs Google Interview Warmup: a warmup, or a real rehearsal?

Google Interview Warmup is a genuinely useful free tool: it asks a few field questions, transcribes your spoken answer, and highlights insights like the words and talking points you used. But it's a warmup, not an interview. Here's where Greenroom takes over.

TL;DR Use Google Interview Warmup for a free, no-signup way to hear yourself answer a handful of generic questions. Use Greenroom when you want an actual interview — real back-and-forth, follow-up questions, prompts about your own GitHub projects, and feedback on what you said, not just word counts.

The short version

Google Interview Warmup gives you five questions from a chosen field, records your spoken answers, transcribes them, and surfaces lightweight insights — which terms you used, what talking points were detected. It's free, requires no account, and is a low-pressure way to get used to speaking your answers aloud. What it doesn't do: ask follow-ups, react to what you said, judge whether your answer was actually good, or know anything about your background.

Greenroom is a full AI voice interview. Ari reads your GitHub repos before the session and asks about the code you actually wrote, then probes with follow-ups, covers system design and behavioral rounds, and ends with specific written feedback. It's an adaptive conversation, not a fixed question set. There's a free tier and paid plans from $10/month.

Feature comparison

What matters	Greenroom	Google Interview Warmup
Price	Free tier; $10–$20/mo	Free
Real back-and-forth / follow-ups	Yes — adaptive	No — fixed questions
Personalized to your GitHub	Yes	No
Judges the content of your answer	Yes — specific feedback	No — only word/insight counts
System design & behavioral rounds	Yes, in depth	Generic questions only
Adaptive difficulty	Yes	No
Hear yourself speak aloud	Yes	Yes
No sign-up required	Free tier, quick start	Yes
Session feedback report	Every session	Insights, not feedback

Where Google Interview Warmup wins

It's free, it's from Google, and there's zero friction — no account, no payment, just start talking. For someone who has never said an interview answer out loud, Interview Warmup is a perfect first step: it removes the awkwardness of hearing your own voice and shows you, gently, how much you ramble or repeat yourself. If all you want is a five-minute confidence warmup before a screen, it does that job well and costs nothing.

Where Greenroom wins

The gap is that a warmup isn't a rehearsal. Interview Warmup never pushes back, never asks "why did you do it that way," and never knows what you actually built. Greenroom does all three:

It follows up. Real interviews are follow-up questions — "why that database?", "what broke?", "what would you change?" Greenroom probes; Warmup just moves to the next fixed prompt.
It's about your work. Greenroom reads your repos and asks about your actual architecture and trade-offs, so you can't coast on rehearsed generic answers.
It judges substance. Warmup tells you which words you used. Greenroom tells you whether your answer was clear, complete, and convincing — and where it was thin.
It covers full rounds. System design, behavioral, HR — not just a handful of field questions.

So which should you use?

Start with Google Interview Warmup if you've never practiced out loud — it's free and frictionless. Then graduate to Greenroom when you want a real interview that reacts to you, asks about your own projects, and tells you how you actually did. Greenroom's free tier costs nothing to try, so you can run your first personalized voice mock the same day.

Try Greenroom free →See pricing

Frequently asked questions

Is Google Interview Warmup a real mock interview?

Not quite. It asks a fixed set of field questions, transcribes your spoken answers, and shows insights like the words and talking points you used. It doesn't ask follow-ups, react to your answers, or score whether they were good. Greenroom runs an adaptive voice interview with follow-ups and feedback.

Is Google Interview Warmup free?

Yes, and there's no sign-up. Greenroom also has a free tier (one full voice session a month) plus paid plans from $10/month, and it does considerably more — personalization, follow-ups, and a feedback report.

What does Greenroom do that Interview Warmup doesn't?

It reads your GitHub and asks about your real projects, holds a real back-and-forth with follow-up questions, covers system design and behavioral rounds, and gives specific feedback on the content of your answers — not just word counts.

Can I use both?

Yes. Use Interview Warmup as a free, low-pressure warmup to get comfortable speaking aloud, then use Greenroom for full, personalized rehearsal before the real thing.

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